doubleTwist hits Macs-- Windows version coming soon

DoubleTwist doubles (sorry for the pun) as an online service and an offline desktop application that can access, convert and transfer most media you throw at it. Plug in a supported device and the program will convert the file for that device and sync it automatically. You can also one-click upload to video and photo sharing sites such as YouTube, Flickr and Facebook.

Users can share and stream videos with other doubleTwist users and videos can be streamed from the service's own Web site or right from inside the app.